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I have two of these. One is quiet, the other noisy, even on the low setting. Can't figure out how to quiet it. It puts out lots of bubbles, especially when a 4" airstone is used. My same airstone has lasted with this pump since I got it. It has two airline outlets, but I only use one. The important thing to remember with any air pump is to attach an anti-siphon valve into the airline. I ordered my Azoos through Foster and Smith, a good company that stands behind its products. I'm happy to say it has continued to provide oxygenation through many power outages, which is a big plus.